Metallic packing for piston-rods.



No. 642,855. Patented Feb. 6, I900. F. E. SMALL.

METALLIC PACKING FOR PISTON RODS.

(Application filed July 7, 1899.) (No Model.)

nllllllllllllllll II I I I I 1.

l'nvezd'nr EedericZrE 153711111 y Mm AZiy.

UNrTnn STATES PATENT OFFICE.

FREDERICK E. SMALL, OF BOSTON, MASSACHUSETTS.

METALLIC PACKING FOR PISTON-RODS.

$PECIFICATION forming part of Letters Patent No. 642,855, dated February 6, 1900.

Application filed July 7,1899. Serial No. 723,068. (No model.)

To ail whom it may concern.-

Be it known that I, FREDERICK E. SMALL, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Metallic Packing for Piston-Rods, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to metallic packing for piston-rods and the like, is an improvement upon the invention described in the Letters Patent No. 490,050, granted to Thomas Tripp January 17, 1893, and it consists in certain novel features of construction, arrangement, and combination of parts, which will be readily understood by reference to the de scription of the accompanying drawings and to the claims hereto appended and in which my invention is clearly pointed out.

Figure 1 of the drawings is a plan of my improved packing. Fig. 2 is an elevation of the same with the spring-inclosing ring or hoop cut in section. Fig. 3 is a plan of one pair of the eight segments of which the packing is composed pivoted together. Fig. 4is an elevation of said two pivoted segments. Fig. 5 is a sectional elevation of said two segments, the cutting plane being on line 00 so on Fig. 3 and looking in the direction indicated by the arrow on said figure. Figs. 6 and 7 are respectively a plan and an edge View of a single segment. Fig. Sis partial section of one of the segments on line y g on Fig. 4 and showing the spring for pressing the interlocking surface together in plan, said figure being drawn to an enlarged scale.

The object of my invention is to simplify and cheapen the construction of the parts and at the same time render them more easily assembled without detracting from their effectiveness, and to this end I construct the packing of two series (1 and 2) of separate and independent segments 3 of uniform shape, each having an outer tangential surface 4 and an inner tangential surface 5, said segments being arranged in pairs, a segment of one series being pivoted to a segment of the other series, with their tangentially-surfaced ends overlapping each other, as shown in Figs. 3 and 4. Each segment 3 is made of the form shown in Figs. 6 and 7, and an upper and a lower segment are secured together by the pivot-screw 6, as shown in Figs. 1, 3, and 5, with their outer tangential surfaces at righ angles to each other.

- In the drawings there are four segments, three in each series 1 and 2, or four pairs of segments all told; but six or eight pairs may be used, if desired, without departing from the principles of my invention, and the several pairs of segments are placed in position around the piston-rod,with the outer tangential surface of each segment contacting with the inner tangential surface of another segment, said contact-surfaces being pressed together by the springs 7, one of which is set in a recess 8, formed in the outer peripheral surface of each segment directly opposite its inner tangential surface, as shown in Figs. 1, 2, 4, and S, the outer ends of said springs abutting against the inner surface of the inclosing band or hoop 9, as shown in Fig. 1.

The several pairs of segments 3 interlock with each other substantially in the same manner as in the before-cited patent, except that the two parts of each pair of segments are movable about their pivotal connection to each other instead of being formed integral or in one piece, and therefore are more readily placed in position around the pistonrod and more efiectively pack said rod, because each segment is pressed with equal force toward the axis of the rod by the springs 7, so located as to act to the best advantage to press the inner tangential surface of each of the segments into contact with the outer tangential surface of a contiguous segment.

In placing the several pairs of pivoted segments, which in the case illustrated consist of four pairs, around the rod which is to be packed it will be seen that the outer end portion of each segment of a pair will overlap the corresponding portion of a segment of another pair, and that the inner tangential surface of each piece of each pair of segments will interlock with the outer tangential surface of a segment of another pair.

A great advantage is obtained by this construction in a material reduction in the cost of manufacture and in the facility with which the parts may be assembled, due to the fact that the segments are pivoted together in pairs and the fact that each segment is pressed toward the rod with equal force with every other segment.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. A metallic packing composed of an even number of independent packing segments each having two plane flat parallel sides, and an outer and an inner tangential surface, said segments being pivoted together in pairs, the two pieces of each pair overlapping each other at their outer tangentially-surfaced ends, and each piece of said pair overlapping at its other end the inner tangentially-surfaced end of one piece of another pair of segments with its inner tangential surface engaging the outer tangential surface of another piece of the same pair of segments.

2. A metallic packing composed of an even number of separate segments, each having two plane parallel sides and an outer and an inner tangential surface, said segments being arranged in pairs occupying different planes and overlapping each other and pivoted together at their outer tangentially-surfaced ends, the outer end of each piece of said pair interlocking with another pair of segments, as set forth, in combination with an endless hoop or band surrounding said segments but removed from contact therewith; and a series of springs interposed between said hoop and segments in positions to press the inner tangential surface of each segment into close contact with the outer tangential surface of another segment.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 5th day of July, A. D. 1899.

FREDERICK E. SMALL.

Witnesses:

N. O. LOMBARD, LoUIs H. MARTELL. 

